COST GUIDES
How much does a solar water heater cost in 2026?
Updated 06/26
Average cost:
The average cost of a solar hot water system is around £4,500
Typical price range:
Most solar thermal systems cost between £3,000 and £8,000 installed
Compatibility:
Most systems work alongside a boiler or immersion heater to provide hot water throughout the year
Output:
A solar water heating system can typically provide 50%–70% of a household's annual hot water needs
A solar hot water system – also known as a solar thermal system or solar water heater – uses energy from the sun to heat water for your home.
Unlike solar PV panels, which generate electricity, solar thermal panels are designed specifically to provide hot water for showers, baths, taps and household cleaning.
If you're looking for a lower-carbon way to heat your water, a solar hot water system can be an attractive option. While the upfront investment isn't small, many homeowners find the long-term savings and reduced reliance on fossil fuels make it worth considering.
In this guide, we'll look at solar water heater costs, installation costs, the different types available and whether a solar thermal system could be right for your home.
Solar thermal systems are designed to heat your household hot water. They don't usually provide space heating for radiators or underfloor heating.
How much does a solar water heater cost in 2026?
Most homeowners can expect to pay between £3,000 and £8,000 for a fully installed solar hot water system, with an average cost of around £4,500.
The final price will depend on the type of solar collector you choose, the size of the system, your roof configuration and whether additional work is needed to upgrade your hot water cylinder.
| Item | Unit | Cost - low | Cost - high | Average cost |
|---|---|---|---|---|
| Solar thermal system | System and installation | £3,000 | £8,000 | £4,500 |
| Solar thermal kit | System | £2,000 | £3,000 | £2,500 |
| Last updated: June 2026 Our costs are ballpark averages - get a local tradesperson to quote now | ||||
For a typical family home, this cost will usually include the solar collectors, solar-compatible hot water cylinder, controls, pipework and installation labour.
One thing that's worth knowing from the outset is that solar thermal systems don't usually replace your existing hot water system altogether. Instead, they work alongside a boiler or immersion heater, which provides backup hot water when solar energy alone isn't enough.
Get a quote for a solar hot water system
Every property is different, so it's always worth getting a few quotes before making a decision.
Compare quotes from checked solar thermal installers working in your area and find the right solution for your home.
Find a solar thermal installer near you
What is a solar water heater and how does it work?
A solar water heater, solar thermal system and solar hot water system all refer to the same technology.
Solar collectors mounted on your roof absorb heat from the sun and transfer that heat to a special fluid circulating through the system
That heated fluid then passes through a coil inside your hot water cylinder, warming the stored water ready for use around your home
On bright summer days, a solar thermal system may provide most of the hot water your household needs. During winter or prolonged cloudy periods, your existing boiler or immersion heater simply tops up the temperature as required.
Solar hot water panels are usually mounted on a south-facing roof where they can capture the most sunlight throughout the day.
Whether a solar thermal system is right for you will depend on your property, budget and how much hot water your household typically uses.
Most domestic solar thermal systems installed in the UK are active systems, meaning they use pumps and controls to transfer heat from the solar collectors to your hot water cylinder.
Solar hot water system costs at a glance
Typical installed cost: £3,000–£8,000
Average installed cost: £4,500
Solar thermal kit only: £2,000–£3,000
Installation time: 1–2 days
Typical roof space needed: 2–5m²
Best suited to homes with a hot water cylinder
Solar hot water system costs by type
These are the two main types of solar thermal panels available to UK homeowners. Both perform the same job but differ in cost, appearance and efficiency.
Flat plate solar thermal collectors
Flat plate collectors are the most common type of solar water heater in the UK.
They consist of a dark absorber plate housed within an insulated glazed panel mounted on the roof.
For many homeowners, they're the practical middle ground between performance and cost. They tend to work well throughout much of the UK and are often the most affordable option.
Most flat plate solar thermal systems fall towards the lower end of the £3,000–£8,000 installed cost range.
A typical installation quote will usually include:
Flat plate solar collectors
Solar-compatible hot water cylinder
Pump station and controller
Pipework and fittings
Installation and commissioning
Evacuated tube solar thermal collectors
Evacuated tube systems use rows of glass tubes rather than flat panels.
They're generally more efficient at capturing heat during colder weather and in lower-light conditions, making them attractive for homeowners looking to maximise hot water production throughout the year.
The trade-off is cost. Evacuated tube systems often sit towards the upper end of the £3,000–£8,000 installed cost range.
Many homeowners are drawn to them because they continue performing well even during the sort of overcast days that make up a fair chunk of a British winter.
As with flat plate systems, installation costs typically include the collectors, cylinder, controls, pipework and labour.
What affects the cost of a solar hot water system?
Solar thermal systems aren't a one-size-fits-all purchase. The right setup for your home will depend on everything from your roof and hot water cylinder to the amount of hot water your household uses each day.
Some of the biggest factors affecting the final cost include:
Collector type: Evacuated tube collectors generally cost more than flat plate systems
Roof type and accessibility: Steeper roofs, complex roof layouts and restricted access can all increase installation costs
Scaffolding requirements: Most two-storey homes will need scaffolding, which can add significantly to the overall project cost
Hot water cylinder compatibility: Many solar thermal systems require a twin-coil cylinder. If your existing cylinder isn't compatible, you'll need to budget for a replacement
System size: Larger households typically require larger collector areas and larger cylinders
Location: The amount of solar energy available varies across the UK, which can influence the size of system recommended for your home
On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.
Additional costs to budget for
Alongside the solar thermal system itself, you may need to budget for extra costs, such as:
Scaffolding
Hot water cylinder replacement
Pipework upgrades
Roof modifications
Heating controls
Annual servicing and maintenance
It's worth asking for an itemised quote so you can clearly see which costs are included and which are optional extras.
What should be included in a quote for a solar hot water system?
A professional solar thermal installation quote will usually include:
Solar collectors
Solar-compatible hot water cylinder
Pump station and controller
Pipework and insulation
Installation labour
Testing and commissioning
System handover and operating instructions
If scaffolding is needed, it's worth checking whether it's included within the quote or if it's an additional cost you'll need to budget for.
How long does it take to install a solar hot water system?
Most solar hot water systems can be installed in 1–2 days.
Typically, the roof-mounted collectors are installed first, followed by the internal pipework, cylinder connections and system commissioning.
If scaffolding is needed, allow additional time for it to be put up and taken down.
From a homeowner's perspective, the disruption is usually fairly manageable. There'll be tradespeople moving between the loft, airing cupboard and roof throughout the installation, but it's generally far less disruptive than larger renewable energy projects.
Is a solar hot water system compatible with a combi boiler?
Unfortunately, a solar hot water system is not usually compatible with a combi boiler.
Solar thermal systems work by heating water stored in a hot water cylinder. Standard combi boilers heat water directly from the mains and don't rely on a cylinder.
If you currently have a combi boiler, you'll normally need a more significant system upgrade to install solar thermal.
For some homeowners, a solar PV system combined with an immersion diverter can be a more straightforward alternative.
We check the reviews on Checkatrade are from real people, and that trades meet our high standards.
What is the cost of installing a solar hot water system yourself?
DIY solar thermal kits are available, with costs averaging around £2,500.
However, remember that the kit price doesn't include scaffolding, specialist tools or installation time.
Solar thermal systems involve roof work, plumbing and system commissioning, so professional installation is usually the safest option.
Another consideration is certification. Many warranties and support schemes require installation by an MCS-certified installer, which isn't available through a DIY installation.
Are solar hot water systems worth it in the UK?
For many people, solar hot water systems are a worthwhile investment.
A well-designed solar thermal system can typically provide between 50% and 70% of a household's annual hot water needs.
That won't eliminate your energy bills, but it can reduce them and lower your home's carbon footprint at the same time.
The payback period varies depending on your hot water usage, energy prices and installation costs.
However, homeowners who use a lot of hot water often see the greatest benefit.
Solar thermal isn't the right choice for every property, but if you already have a suitable hot water cylinder and a reasonably sunny roof, it can be a worthwhile long-term investment.
Solar hot water system checklist
When should you speak to a solar thermal installer?
If you're already considering renewable energy improvements, planning to replace a hot water cylinder or looking for ways to reduce your household energy consumption, it's worth speaking to an installer early on.
A quick site survey can help to rule out unsuitable options before you've invested too much time researching them.
Find a checked solar thermal installer near you
The right installer can help you understand your options, explain likely savings and recommend a system that's properly sized for your household.
Compare quotes from checked solar thermal installers working in your area.
Browse solar thermal installation services in your area
Enter your postcode to find a top tradesperson near you
Logical Heating & Plumbing Solutions Ltd
9.63
(1081 reviews)Services & skills
Renewable EnergySolar Thermal Heating InstallationSolar Panel InstallationSolar Panel Servicing / RepairSolar Roof Servicing / Repair
FAQs
What is the average cost of a solar hot water system?
The average cost of a solar hot water system is around £4,500, although most homeowners pay between £3,000 and £8,000 depending on the size and specification of the system.
How do solar hot water systems work?
Solar collectors on your roof absorb heat from the sun and transfer it to a heat-transfer fluid. That heat is then used to warm water stored in a hot water cylinder.
How much does a gas-boosted solar hot water system cost?
Most solar thermal systems use a boiler or immersion heater as a backup heat source. In many cases, the overall installation cost remains within the typical £3,000–£8,000 range, particularly if you can continue using your existing boiler.
Is my heating system compatible with a solar thermal system?
Most homes with a hot water cylinder can accommodate a solar thermal system. Homes with combi boilers often need additional work or alternative solutions.
What grants are available for solar hot water systems in 2026?
The Green Homes Grant closed in 2021 and is no longer available. Solar thermal systems are not currently covered by the Boiler Upgrade Scheme, although installations may benefit from 0% VAT. Support schemes can change, so it's always worth checking the latest government guidance.
How much roof space do I need for solar thermal panels?
Most domestic solar thermal systems need around 2–5m² of suitable roof space, depending on the size of the system and your household's hot water requirements.
More Solar Thermal Heating Installation Articles
See the tradespeople we've checked for your job